Differential-pressure device.



L282AL5L C. F. WALLACE & M. F. TIERNAN.

DIFFERENTIAL PRESSURE DEVICE.

APPLICATION FILED 05cm I916.

Patentm 001;. 22, 1918. 1 M

2?) -20 z A Q 45 66 55 Q1.

UNITED STATES PATENT OFFICE.

CHARLES F. WALLACE, OF NEW YORK, AND MARTIN F. TIERNAN, OF NEW ROCHELLE,

1 NEW YORK.

DIFFERENTIAL-PRESSURE DEVICE.

Specification of Letters Patent.

Patented @ct. 22, 1918.

original application filed March 26, 1915, Serial No. 17,122. Divided and this application filed December 7,

1916. Serial No. 135,713.

To all whom it may concern:

Be it known that we, CHARLES F. WVAL- LACE and MARTIN F. TIERNAN, citizens of the United States. residing at Tompkinsville, borough of Richmond, city and State of New York. and New Rochelle, county of estchester and State of New York, respectively, have invented certain new and useful Improvements in Differential-Pressure Devices, of which the following is a clear, full, and exact description.

This invention relates to valved differential pressure devices, such as disclosed in our application for patent filed hlarcli 26, 1915, Serial No. 17,122, of which this application is a division. Said application discloses an apparatus for controlling gases or flowing mediums, such as chlorin gas, for controlling the supply thereof to a liquid to be treated such as water, and the subjectmatter of the present invention is preferably associated with a control valve.

One of the objects of the present invention is to provide means associated with a control valve, which when the latter has been set for a particular flow through the line to a particular flow of liquid which is to act upon the flowing medium passing through the line, is adapted to establish an equilibrium between the drops in pressure across the control valve and the point or points or control, such as the Venturi throat, in the conduit through which the said liquid passes.

Another object of the invention is to provide means for establishing proportional flows of a gas and a liquid, such, for instance, as chlorin and water. Another object of the invention is to provide a valved diiferential pressure device which is acted upon automatically by different back pressures in the line through which the flowing substance, such as chlorin gas, passes. A further object of the invention is to provide a differential pressure device constructed with particular reference to its use in a line through which chlorin gas or the like flows. Other objects are to provide a novel, practical and efiicient valved ditferential pressure device.

These being among the objects of the present invention, the same consists of certain features of construction and combinations of parts to be hereinafter described and then claimed with reference to the ac con'lpanying drawing illustrating a desirable embodiment of the invention, and in which Figure 1 is a diagrammatic view showing apparatus for obtaining proportional flows, and involving a valved differential pressure device according to the present invention;

Fig. 2 is an enlarged diainetrical section of the valved ditl'erential pressure device associated with a control valve, and showing certain piping employed therewith;

Fig. 3 is an enlarged detail section of a portion of the ditferential pressure device, on the line 33 of Fig. 2, to clearly illustrate the preferred form of stutling box; and

Fig. 4 is a section on the line H, Fig. 2, to show certain details.

Referring more particularly to Fig. 1, it is assumed that a liquid, such as Water to be purified, passes through a main comprising the barrel 25 of a Venturi connection provided with a throat 26. It is also assumed that chlorin gas, for instance, flows from a suitable container through the pipe 32 to a valved differential pressure device 33. A control valve (37 is located in the line 66, but the function of this valve in connection with the valved differential pressure device and associated parts will be described more particularly hereinafter.

The differential pressure device 33 (Fig. 1) is shown in detail in Figs. 2, 3 and 4, and the object thereof is to operate a valve which, for instance, maintains a proportionate flow of chlorin to the flow of water. The preferred construction of the said device as shown, is predicated upon the use of six chambers, 83, 83 and 84, 84, and 85 85*, but the number of these chambers is not a fixed quantity. Four, for instance, may be used, and substantially the same operation of the valve involved accomplished. As shown, said chambers are in part formed through the medium of four cast members or plates 87, 88, 89 anl 90 which are suitably secured together, but the same ultimate object may evidently be accomplished by a different construction, as for instance, embodying the chambers 83, 83 in one unit, chambers 84: and 84: in another unit, and chambers 85 and 85 in a third unit, all separated from each other, but suitably connected in the system, to function, as will shortly appear. The adjacent walls of each of the pairs of the six mentioned chambers are composed or flexible septa; thewall between chambers 83, 83 may be formed by diaphragm 9-1, that between chambers 8-1, 84: by diaphragm 92, and that between the two other chambers by diaphragm 99. These diaphragmsmay of course be quite thin and sensitive if a suitable reinforced construction is used.

High pressure and low pressure pipes 9 1, 95, respectively, are connected with the barrel 25 of the Venturi connection and '26 of the Venturi throat, as shown in Fig. 1. These pipes may be provided with control valves or, 95*, and respectively lead to diaphragm chambers 84 and 861*, so that the former is a high pressure chamber and the latter a low pressure chamber. Secured to the casing member 90 of the differential pressure device, as by a screw connection, is a head or coupling element 96. Said head is provided with a short pipe'section 32 to which the pipe 32 leading from the source of supply is connected. At the other side of the said head is a pipe connection 66 to which is connected pipe 66 which leads to control valve 67. A branch pipe 97 leads from a point beyond the control valve 67 to diaphragm chamber 88 so that the drop in pressure across the said control valve is transmitted to said diaphragm chamber.

For reasons which will appear later, the diaphragm chambers 88, are connected together by a passage 98 which extends through the members or sections 88, 89, and the said chambers are filled with a suitable liquid which is hermetically sealed therein. For all practical purposes it will be seen that the diaphragms 91 and 93 act as one.

Head or coupling member 96 is provided with a duct 99 which leads from the pipe 32, said duct extending in the direction of the central axis of the diaphragm chambers, and the terminal being constituted by a nipple 100 which is screwed into said head, and is provided with a seat for a needle valve 101. Said valve is located in a valve casing 102, which is preferably ahollow cap secured onto the head 96 by means of a nut 102. The chamber of said valve casing leads by means of a duct 103 in the head 96 to the pipe 66 to the control valve, while a duct 10a branches off in opposite direction and leads to a chamber extension 105 formed in the associated member and head 96, and which is an extension of the diaphragm chamber 85. Consequently any pressure of the gas in ducts 103, 104:, will be transmitted to the diaphragm 93. Attached to the central portion of diaphragm 93 is a hollow guard 106, into the hollow or chamber 107 of which there extends a reciprocatory rod or stem 108 which is guided through the member 89, its inner end being in contact with the diaphragm 92. To properly seat the em gaging end of the said rod 108 against the guard 106, the inner end of'the chamber 107 is tapered, and it will be seen that any movement of the diaphragm 92 toward said rod with a cross piece 111 whichsupports the valve 101, so that the needle point thereoi extends toward the valve aperture or duct 99. Cushioning springs 111, 111 are preterably applied to the rods 109, 110. The guard member 106 and the said two rods 109, 110, hold the valve central toward its seat, said rods being guided through holes 112 in the head or coupling member 96.

The described means for transmitting power to said valve preferably comprehends an improved construction of stuiiing box. This is clearly illustrated in Fig. 3. It will be seen that the casing member 89 is provided with a screw plug 113, through which the stemor rod 108 is guided, and said plug is secured to one end of an elastic tube 114 preferably composed of rubber, the other end of said tube being secured to a collar 115 located on the rod or stem 108. The walls of the said rubber tube are supported by helical springs 116, 117, the former being coiled upon the exterior of said tube while thc latter is located within said tube. The spring 116 prevents the bursting of the tube 114: while spring 117 prevents the collapse of said tube, and supports the rubber away from the rod 108. 1t will be seen that the elasticity of the tubing 114: will allow slight lateral motion of the rod with practically no friction, and that there can be no leak from the chamber 84 into the gas chamber 85, inasmuch as the elastic tubing is impervious and covers the joint more tightly with increased pressure. Y

The pressure beyond the valve 67 is preterably transmitted through a diaphragm chamber to a gage, not shown, so that the pressure of the gas at this point can be read 011. @ontrol valve 67 may be of any suitable construction, such as is shown and described in our parent application before referred to.

The operation of the described diiferential pressure device and its valve, and the control valve 67 so far as its function is allied thereto, will now be described. In the construction described, the two chambers containing the hermetically sealed liquid may theoretically be considered as one, as befor e stated, but practically there are two of them so that there can be no chance for a leak of gas from the gas side of said device to the water side thereof, or vice versa. The drop in pressure of the gas across the control valve 67 will increase with increased flows of gas, and in a like manner the drop in pressure across the Venturi throat will increase with increased flows of water. WVhen the control valve 67 has been set for a particular flowof chlorin to a particular flow of water, an equilibrium will be established between drops in pressure across the said control valve and said Venturi throat. If there should be an increase in the flow of water, this equilibrium will be broken and the dif ferences in pressure in the diaphragm chambers 84c, 84 which contain water will act to deflect or press the diaphragm 92 upon the rod 108, thereby operating the needle valve 101 to produce a larger opening for the gas as it flows from pipe 32 into pipe 66, and consequently more gas is allowed to flow across the control valve 67. \Vhen the diaphragm 92 has been forced forward far enough to allow sufficient gas passing the control valve (37 to create a drop in pressure across said valve in proportion to the drop in pressure across the Venturi throat, there will be proportional flows of chlorin and water. Should the flow of water become less, the said diaphragm will act in the same way, it being forced back until equilibrium is established.

It is obvious that should there be greater or less back pressure of chlorin-in line 68 or greater or less pressure in the chlorin flask or tank, the valve 101 is automatically operated as follows: For greater flows of chlorin diaphragm 93 will be forced forward toward the valve 101 because of the increased drop in pressure across the control valve 67. This pressure will be transmitted to the diaphragm 91 by means of the hermetically sealed body of liquid in chambers 85, 85 and there will be established a flow of chlorin across the valve 67 such as to.

give equilibrium of pressures in chambers 84 and 85. This will bring the diaphragm 91 in equilibrium and thus establish a drop in pressure across the ViLlW 67, in proportion to the drop in pressure across the Venturi connection, thereby giving proportional flows of gas and water.

It is obvious that the invention is susceptible of modification, as parts may be omitted, parts added, and parts substituted without departing from the spirit and scope thereof as expressed in the claims.

lVhat we claim as new is 1.- A differential pressure device comprising in combination; six chambers arranged in pairs and the chambers of each pair being separated by a diaphragm, a chambered part associated therewith and provided with a valve operable through the medium of two of said diaphragms, and a hermetically sealed body of liquid between one of the said diaphragms, and a hermetically sealed 4 bodyof liquid between one of the chambers associated with one of said two diaphragms and one of the chambers associated with the third diaphragm.

3. A differential pressure device comprising in combination, four chambers arranged in pairs and the chambers of each pair being separated by a diaphragm, a chambered part associated therewith and provided with a valve, means for positively operating said valve in one direction through the medium of one of said diaphragms, and means for positively operating said valve in opposite direction through the medium of the other of said diaphragms.

4. A diiferential pressure device comprising in combination; four chambers arranged in pairs and the chambers of each pair being separated by a diaphragm, a chambered part associated therewith and provided with a valve, means for positively operating said valve in one direction through the medium of one of said diaphragms, and means for positively operating said valve in opposite direction through the medium of the other of said diaphragms, one of said chambers being hermetically sealed.

5. A differential pressure device comprising in combination; four chambers arranged in pairs and the chambers of each pair being separated by a diaphragm, a chambered part associated therewith and provided with a valve, means for positively operatingsaid valve in one direction through the medium of one of said diaphragms, and means for positively operating said valve in opposite direction through the medium of the other of said diaphragms, said means comprising a stem of said valve passing through one of said diaphragms, and means for hermetically sealing said diaphragm and the part thereof through which said stem passes, against the contents of the chambers for the other diaphragm.

6. A difierential pressure device comprising in combination, four chambers arranged in pairs and the chambers of each pair being separated by a diaphragm, a chambered part associated therewith and provided with a valve, means for positively operating said valve in one direction throughthe medium Y positively operating said valve in opposite direction through the medium of the other of said diaphragms, said means comprising a stem and a stufiing box through which the said stem passes, saidstuifing box comprising a flexible sleeve fixed at one end and movable from its other end by said stem and a helical spring device for reinforcing said sleeve.

8. A differential pressure device comprising in combination, a plurality of chambers provided with diaphragms, a chambered part associated therewith and provided with a valve operable through the medium of said diaphragms, and a hermetically sealed body oi liquid between two of said diaphragms.

9. A differential pressure device comprising in combination; a series of variable pres sure chambers, a chambered art assomated therewith and provided wit a valve, the controlled orifice of Which leads to one or" said chambers, means for positively operating said valve in one direction through a difference in pressure in some of said chambers, and means for positively operating said valve in opposite direction through a difference in pressure in others of said chambers.

10. A difierential pressure device comprising in combination, a casing provided with a plurality of sensitive diaphragms, a body or" liquid sealed between two of said diaphragms a valve, and means for operating said diapliragms to open and close said valve.

Signed at New York, N. 5., this 4" day or" December, 1916.

CHARLES l WALLACE l /lARlll T l TIERNAN.

Witnesses:

BEATRICE Mini/1s, Emails/r BERNSTEIN. 

